What Are These Large Buttons & How Can I Find Them?

Q: I am creating a play area for my daughter and came upon these really fun leather XL buttons nailed to the wall. I thought they could be used first as protection on the wall and secondly as a fun design. Now, my lack of vocabulary (Frenchy) in interior design brings me to ask you if you have any idea about what this could be called and how/where can I find them?